Sep 17 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Forging Hot Working Cold Working AnnealingApplications
Introduction
UNS C17300 beryllium copper alloys are heat treatable, ductile and can be mill hardened. They offer tensile strength of 1380 MPa (200 ksi). These steels are suitable for applications requiring good conductivity, high strength and stiffness.
This article will give an overview of UNS C17300 beryllium copper alloys.
Chemical Composition
The following table shows the chemical composition of UNS C17300 copper.
| Element |
Content (%) |
| Cu |
97.7 |
| Be |
1.9 |
| Co |
0.40 |
Physical Properties
The physical properties of UNS C17300 copper are given in the following table.
| Properties |
Metric |
Imperial |
| Density (during age hardening, 2% max. decrease in length and 6% max. increase in density) |
8.25 g/cm3 |
0.298 lb/in3 |
| Melting point |
866°C |
1590°F |
Mechanical Properties
The mechanical properties of UNS C17300 copper are tabulated below.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B |
80.0 - 85.0 |
80.0 - 85.0 |
| Tensile strength, ultimate |
515 - 585 MPa |
74700 - 84800 psi |
| Tensile strength, yield |
275 - 345 MPa |
39900 - 50000 psi |
| Elongation at break |
15.0 - 30.0% |
15.0 - 30.0% |
| Modulus of elasticity |
125 - 130 GPa |
18100 - 18900 ksi |
| Poissons ratio |
0.300 |
0.300 |
| Machinability (UNS C36000 (free-cutting brass) = 100%) |
20% |
20% |
| Shear modulus |
50.0 GPa |
7250 ksi |
Other Designations
Other designations that are equivalent to UNS C17300 copper include:
Fabrication and Heat Treatment
Machinability
The machinability rate of C17300 copper alloys is 50%.
Welding
C17300 copper alloys can be welded using soldering, brazing, gas shielded arc welding, coated metal arc welding, spot welding, seam welding and butt welding. Oxyacetylene welding is not recommended for this type of alloys.
Forging
C17300 copper alloys are forged at temperatures ranging from 649 to 816°C (1200 to 1500°F).
Hot Working
C17300 copper alloys have good hot working property.
Cold Working
C17200 copper alloys have excellent cold working property.
Annealing
Annealing of C17200 copper alloys is performed at temperature ranging from 774 to 802°C (1425 to 1475°F).
Applications
The following are the major applications of UNS C17300 copper:
- Electrical/electronic connectors
- Current-carrying springs
- Precision screw machined parts
- Welding electrodes
- Bearings
- Plastic molds
- Corrosion resistant components.